@Override protected String buildString() { StringBuilder sb = new StringBuilder(); String ls = System.getProperty("line.separator"); sb.append("[UDP Header (").append(length()).append(" bytes)]").append(ls); sb.append(" Source port: ").append(getSrcPort()).append(ls); sb.append(" Destination port: ").append(getDstPort()).append(ls); sb.append(" Length: ").append(getLengthAsInt()).append(" [bytes]").append(ls); sb.append(" Checksum: 0x").append(ByteArrays.toHexString(checksum, "")).append(ls); return sb.toString(); }
@Override protected String buildString() { StringBuilder sb = new StringBuilder(); String ls = System.getProperty("line.separator"); sb.append("[UDP Header (").append(length()).append(" bytes)]").append(ls); sb.append(" Source port: ").append(getSrcPort()).append(ls); sb.append(" Destination port: ").append(getDstPort()).append(ls); sb.append(" Length: ").append(getLengthAsInt()).append(" [bytes]").append(ls); sb.append(" Checksum: 0x").append(ByteArrays.toHexString(checksum, "")).append(ls); return sb.toString(); }
private UdpPacket(byte[] rawData, int offset, int length) throws IllegalRawDataException { this.header = new UdpHeader(rawData, offset, length); int payloadLength = header.getLengthAsInt() - header.length(); if (payloadLength < 0) { throw new IllegalRawDataException( "The value of length field seems to be wrong: " + header.getLengthAsInt()); } if (payloadLength > length - header.length()) { payloadLength = length - header.length(); } if (payloadLength != 0) { // payloadLength is positive. PacketFactory<Packet, UdpPort> factory = PacketFactories.getFactory(Packet.class, UdpPort.class); Class<? extends Packet> class4UnknownPort = factory.getTargetClass(); Class<? extends Packet> class4DstPort = factory.getTargetClass(header.getDstPort()); UdpPort serverPort; if (class4DstPort.equals(class4UnknownPort)) { serverPort = header.getSrcPort(); } else { serverPort = header.getDstPort(); } this.payload = PacketFactories.getFactory(Packet.class, UdpPort.class) .newInstance(rawData, offset + header.length(), payloadLength, serverPort); } else { this.payload = null; } }
private UdpPacket(byte[] rawData, int offset, int length) throws IllegalRawDataException { this.header = new UdpHeader(rawData, offset, length); int payloadLength = header.getLengthAsInt() - header.length(); if (payloadLength < 0) { throw new IllegalRawDataException( "The value of length field seems to be wrong: " + header.getLengthAsInt()); } if (payloadLength > length - header.length()) { payloadLength = length - header.length(); } if (payloadLength != 0) { // payloadLength is positive. PacketFactory<Packet, UdpPort> factory = PacketFactories.getFactory(Packet.class, UdpPort.class); Class<? extends Packet> class4UnknownPort = factory.getTargetClass(); Class<? extends Packet> class4DstPort = factory.getTargetClass(header.getDstPort()); UdpPort serverPort; if (class4DstPort.equals(class4UnknownPort)) { serverPort = header.getSrcPort(); } else { serverPort = header.getDstPort(); } this.payload = PacketFactories.getFactory(Packet.class, UdpPort.class) .newInstance(rawData, offset + header.length(), payloadLength, serverPort); } else { this.payload = null; } }
@Test public void testGetHeader() { UdpHeader h = packet.getHeader(); assertEquals(srcPort, h.getSrcPort()); assertEquals(dstPort, h.getDstPort()); assertEquals(length, h.getLength()); assertEquals(checksum, h.getChecksum()); UdpPacket.Builder b = packet.getBuilder(); UdpPacket p; b.length((short) 0); p = b.build(); assertEquals((short) 0, (short) p.getHeader().getLengthAsInt()); b.length((short) -1); p = b.build(); assertEquals((short) -1, (short) p.getHeader().getLengthAsInt()); b.length((short) 32767); p = b.build(); assertEquals((short) 32767, (short) p.getHeader().getLengthAsInt()); b.length((short) -32768); p = b.build(); assertEquals((short) -32768, (short) p.getHeader().getLengthAsInt()); }